Add an IPC method for Blink to call RapporService::RecordSample()

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index c4a05a2dcdffbae56ea1fed67fd250651310795a..a2c461bd46ee96580434cb2b94b945ad2060b1c6 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -165,6 +165,9 @@ class CONTENT_EXPORT RenderThreadImpl
   void EnsureWebKitInitialized() override;
   void RecordAction(const base::UserMetricsAction& action) override;
   void RecordComputedAction(const std::string& action) override;
+  void RecordRappor(
+      const std::string& metric,
+      const std::string& sample) override;
   scoped_ptr<base::SharedMemory> HostAllocateSharedMemoryBuffer(
       size_t buffer_size) override;
   cc::SharedBitmapManager* GetSharedBitmapManager() override;